Electrode with cooled metallic head



IVI. SPERLING.

ELECTRODE WITH COOLED METALLIC HEAD.l

APPLICATION FILED AUG.25. 1913.

1,408,418, Patented Feb. 28, 1922.

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UNITED STA PATNT OFFICE.

HARTIN'SPERLING, 0F ESSEN-ON-THE-RUHR, GERMANY, SSIGNOR T0 FRIED. KRUPP AKTIENGESELLSGH'FT, F SENNTHE-RUHR, GERMANY.

ELECTRODE WTH COGLEID METALLIC HEAD.

Specification of Letters Patent. Patented Feb. 28, 192% Application led .August 25, 1.913. Serial No. 786,529.

(GRANTED UNDER THE PRVXSINS DIF THE ACT @F HRCE 3, 19581, 41 STAT. L., 13.13.)

To all -zcwm 'it may concern- Be it known that I, Dr. MARTIN SrnRLrNG, residing at Essen-on-the-Ruhr, Germany, a subject of the Emperor of Germany, have invented a certain new and useful Improvement in Electrodes with Cooled Metallic Heads, of which the following is a specification.

This invention relates to electrodes with metallic cooled heads and has for its object to provide a readily releasable connection between the electrode and the electrode head, by means of a Good conductor of the electric current, whereby at the same time, the undesirable effects of sparking. between the electrode and the electrode head will be avoided with certainty.

The accompanying drawing shows an einbodiment of the invent-ion designed for electric furnaces, the view being a longitudinal section through the upper portion or. the electrode, the electrode head and its support.

With the electrode A of carbon, the metallic head B, cooled through means of water. and preferably constructed as illustrated in the drawing, is connected through means of a threaded tap b1 which is likewise lushed with water, and this threaded tap?)l projects, with play, into a correspondingly threaded recess of the carbon. The. intermediate space is iilled with an easily fusible metal C, whose melting point is preferably below 100 (centigrade). for example llloods metal. The electrode head B is mounted in an arm D which can be raised and lowered upon a standard, not shown.

lt the contact` between the carbon and the metallic filling C, or between the tap El and the metal filling C, is incomplete at, any point, so that in the passage of the electric current sparks occur, the adjacent metal melts immediately and fills the aperture. The arcing thus ceases immediately belfore any injury t0 the thread can occur. If the connection ybetween the carbon and the head B is to be released, the cooling vis arrested while the current is Howing. Consequently, a suicientheating occurs to melt the metal C. The carbon can then be readily unscrewed. The metal C collects in the base of the hollow space of the carbon,

.and can be used again without loss.

lll-That is claimed is 1. An electrode and its head, having a projection on one part entering. a recess on the other part. the walls of said projection and recess having a space between them containing a metal whose fusing point is sufficiently low to be fused by the heat developed by the current flowing through the electrode said projection being hollowed out for a -cooling fluid in order to normally keep said projection on one part entering a recess on the other, a metal having a fusing point suii'iciently low to be fused by the current flowing therethrough and being interposed between said projection and the walls of said recess, and means for cooling said head and projection adapted to be interrupted at thereby normally keeping said metal soi The foregoing specification signed at Barmen, Germany, this 4th day of August,

MARTN. SPERLING. [n s] ln presence of* HELEN Norme, Armar Noren. 

